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Measuring dynamic-strain profile and history with a drum camera

A continuous record of the plastic-strain profile can be obtained during a dynamic test in tension, torsion or compression through use of a low-speed, rotating-film drum camera

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Abstract

A low-speed drum camera has been used to continuously record the strain profile in several different types of impact tests. The drum camera was selected because it is inexpensive and simple to use, and it overcomes many of the inherent disadvantages of other dynamic-recording techniques.

The use of the drum camera in recording the strain profile in tensile and torsional impact is illustrated, as well as the determination of impact velocity in collinear plastic impact of two bars. A detailed discussion of determination of the strain profile from the tensile-test film record is presented, including an analysis of the accuracy achieved. It was found that the drum camera is capable of measuring strains to an accuracy of approximately 1 percent for a gage length of 0.05 in. Strains varying from 1 to 100 percent were measured in the tensile test, with a nominal strain rate of 20 sec−1. Strain rates of up to 2000 sec−1 were successfully recorded in the torsional impact tests.

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Authors and Affiliations

  1. Ahmadu Bello University, Zaria, North Central State, Nigeria

    Richard S. Culver (Lecturer in Mechanical Engineering)

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  1. Richard S. Culver
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Culver, R.S. Measuring dynamic-strain profile and history with a drum camera. Experimental Mechanics 10, 288–293 (1970). https://doi.org/10.1007/BF02320680

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  • DOI: https://doi.org/10.1007/BF02320680

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